Touchscreen calibration

[espruino-discuss2]

Posted at 2022-05-05 by MoeMoep

Is there a way to do a touchscreen calibration? I currently have to touch ~3-4 mm above the actual thing I want to hit.

[espruino-discuss2]

Posted at 2022-05-05 by user140377

May be not that much here, but I've always wondered if the touchscreen or my hand-eye-coordination needs calibration.

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Posted at 2022-05-05 by Sir_Indy

This thread is asking the same question, you might be able to join forces: http://forum.espruino.com/conversations/375397

But similar to user140377, I think the touchscreen is probably accurate and it's just using big fingers on a tiny screen that makes it tricky. I'm getting better at hitting the button I want with practice.

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Posted at 2022-05-05 by user140377

I have a capacitive touchscreen pen somewhere, probably will check that.

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Posted at 2022-05-05 by @gfwilliams

Right now there's no calibration. If it actually turns out to be a problem then it's something that could be added, but it probably makes more sense to do it in the firmware.

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Posted at 2022-05-05 by MoeMoep

Good Idea, got a tiny-tip-touch-pen right here.
The metal ball is the actual touch point. Basically the attached video shows the options screen. Tap on "Apps" will open the "System" Screen. Will happily do more debugging.
It's not the 3-4mm i have above, that is probably the fat-finger-on-tiny-display problem.

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Attachments:

• BangleTouch.mp4

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Posted at 2022-05-06 by @gfwilliams

Interesting, thanks! The best way to know for sure would be there's a 'paint' app you can install.

Or you can do something along the lines of:

Bangle.on('touch', (b,e) => {
  g.clear(1).fillCircle(e.x,e.y,4);
});

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Posted at 2022-05-06 by user140377

I guess there is a paint app: https://banglejs.com/apps/?id=tinydraw

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Posted at 2022-05-06 by Kane

Hello,

It is not perfect but seem to work well for me, if you want you can give it a try:
https://yarg-mirror.github.io/BangleApps/?q=calibration

I will try to update it until it is good enough to be submited for the official app loader

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Posted at 2022-05-09 by @gfwilliams

That's great - thanks!

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Posted at 2022-05-11 by Kane

Hello,

The application seem to work well, integrate with the App Loader, have a (simple) setting page that allow to active or deactivate it's effect. But I am not sure how to do the PR to submit it, since I added it as a submodule on my side, if I subit it in this state it only suggest to add it in the same way.

Should I delete everything and just add the files manually before submiting it or is that format ok too?

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Posted at 2022-05-11 by @gfwilliams

Ahh, yes - please can you just add the files straight to the repo?

It was discussed about submodules a while back but it just makes things too tricky. 500 submodules would be crazy slow to clone, and imagine we change something in the firmware and have to update a bunch of apps to make it work - we'd have to manually send out hundreds of PRs (which would be pretty much impossible).

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Posted at 2022-05-11 by Kane

Sure no problems :)

Fork redone and PR sent o7

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Posted at 2022-05-11 by MoeMoep

Works like a charm. Calibration App showed sth like -10 for vertical after 20 crosses.